Permission problem index.html when create new sites

When I create a new website have the index.html die permission

-rwxr-x--- 1 web4 client0 1243 2008-04-09 13:36 index.html

and I see in browser the first site of the client when I change permission to

-rwxr-xrwx 1 web6 client0 1236 2008-04-10 14:35 index.html

I see the Site and it works